CN219350602U

CN219350602U - Lithium ion battery with temperature protection

Info

Publication number: CN219350602U
Application number: CN202223575759.1U
Authority: CN
Inventors: 罗加鹏
Original assignee: Shenzhen Shentong World Technology Co ltd
Current assignee: Shenzhen Shentong World Technology Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-07-14
Anticipated expiration: 2032-12-30

Abstract

The utility model relates to the technical field of lithium ion batteries and discloses a lithium ion battery with temperature protection, which comprises a battery core and a protective shell, wherein one end of the top of the battery core is provided with a PCB (printed circuit board), one side of the PCB is welded with a temperature switch, one side of the PCB is welded with a connecting wire, one end of the connecting wire is provided with a connecting terminal, and the outer sides of the PCB and the temperature switch are provided with the protective shell. Meanwhile, the temperature switch is small in size, more structural space can be provided for increasing and decreasing the capacity of the lithium ion battery, the cruising ability of the electronic product is improved, and the use experience of a user is improved.

Description

Lithium ion battery with temperature protection

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with temperature protection.

Background

An ion battery, a secondary battery (rechargeable battery), operates mainly by means of lithium ions moving between a positive electrode and a negative electrode. Li+ is inserted and extracted back and forth between the two electrodes during charge and discharge: during charging, li+ is deintercalated from the positive electrode, is intercalated into the negative electrode through the electrolyte, and is in a lithium-rich state, and the opposite is performed during discharging.

At present, lithium batteries are widely applied to portable digital products and are favored by people, but the conventional lithium ion batteries have some defects in the use process.

In the charge and discharge process of the lithium ion battery, the risk of overcurrent and overheat exists, and the combustion and even explosion conditions easily occur under extreme conditions. The prior art generally adopts measures such as voltage or current limitation, thermistor and the like. However, the thermistor has the defects of large volume, low sensitivity, incapability of timely and synchronously controlling temperature and current, slow response speed and incapability of timely shutting off current, and meanwhile, the active material space of the battery is compressed, and the energy density is low. Especially in the present day of miniaturization of digital products, the requirements for volume thinning and miniaturization of batteries are improved, the energy density directly influences the cruising ability and the use experience of users.

Disclosure of Invention

The utility model aims to provide a lithium ion battery with temperature protection, which solves the problems that the volume of a thermistor is large, the sensitivity is low, and the temperature and the current cannot be synchronously controlled in time in the process of controlling overcurrent and overheat of the thermistor in the conventional lithium ion battery.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a lithium ion battery with temperature protection, includes electric core and protective housing, electric core top one end is equipped with the PCB board, PCB board one side welding has temperature switch, PCB board one side welding has the connecting wire, connecting wire one end is equipped with connecting terminal, PCB board and temperature switch outside are equipped with the protective housing.

Further, the temperature switch comprises a shell, the inner wall of the bottom of the shell is provided with a static contact, the inner wall of the top of the shell is provided with a movable contact, the bottom of the movable contact is provided with a bimetallic strip, one side of the bottom of the bimetallic strip is provided with a movable contact, one side between the bimetallic strip and the static contact is provided with a fixing seat, and one end of the fixing seat is provided with a wire.

Furthermore, epoxy resin is arranged between the fixing seat and the lead, and the temperature switch is positioned at one end of the lead and is sealed by the epoxy resin.

Further, the battery core and the PCB are welded and fixed through nickel plates, and the connecting wire and the PCB are welded and fixed through tin.

Further, the bimetallic strip is arc-shaped, a gap is reserved between one end of the bimetallic strip, on which the movable contact is mounted, and the static contact, the bimetallic strip is in a free state, the movable contact and the static contact are in a closed/open state, when the temperature rises to an action temperature value, the bimetallic element is heated to generate internal stress to act rapidly, and the contact is opened/closed to cut off/switch on a circuit.

Furthermore, the temperature switch is fixed on the PCB board through soldering and forms a series circuit with the battery core.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, through the arranged battery core, the PCB and the temperature switch, when the lithium ion battery with temperature protection is used, the temperature switch is connected in series to the current, and the temperature and the current are actively controlled, so that the risk of combustion and explosion of the lithium ion battery is reduced, and the safety of the lithium ion battery is improved. Meanwhile, the temperature switch is small in size, more structural space can be provided for increasing and decreasing the capacity of the lithium ion battery, the cruising ability of the electronic product is improved, and the use experience of a user is improved.

Drawings

Fig. 1 is a front view of a lithium ion battery with temperature protection according to the present utility model;

FIG. 2 is a front cross-sectional view of a temperature controlled switch connection structure of a lithium ion battery with temperature protection according to the present utility model;

FIG. 3 is a top cross-sectional view of a temperature controlled switch connection structure for a lithium ion battery with temperature protection according to the present utility model;

fig. 4 is a schematic diagram of a connection structure of a PCB board of a lithium ion battery with temperature protection according to the present utility model;

fig. 5 is a schematic diagram of a connection structure of a PCB board of a lithium ion battery with temperature protection according to the present utility model;

fig. 6 is a schematic circuit diagram of a lithium ion battery with temperature protection according to the present utility model.

In the figure: 1-an electric core; 2-a protective shell; 3-a PCB board; 4-a temperature switch; 401-a housing; 402-moving contact; 403-bimetallic strip; 404-static contact; 405-fixing seat; 406-epoxy resin; 407-moving contact; 408-conducting wires; 5-connecting wires; 6-connection terminals.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1-6, the present utility model provides a technical solution: the utility model provides a lithium ion battery with temperature protection, including electric core 1 and protective housing 2, electric core 1 top one end is equipped with PCB board 3, PCB board 3 one side welding has temperature switch 4, PCB board 3 one side welding has connecting wire 5, connecting wire 5 one end is equipped with connecting terminal 6, PCB board 3 and temperature switch 4 outside is equipped with protective housing 2, establish ties through temperature switch 4 and electric core 1 and PCB board 3, when electric core charge and discharge, temperature and electric current in the charge and discharge process of electric core 1 are monitored through temperature switch 4, when the electric current is great or the temperature is higher than temperature switch 4's setting value, the inside bimetallic strip of temperature switch 4 takes place thermal deformation, cut off or switch on to the circuit is automatic, thereby play overheat, overload protection's effect.

The temperature control switch 4 indicated by letter F in FIG. 6 is a TB02 type temperature controller. The device has the characteristics of small volume (the current minimum size is 10mm multiplied by 5.0mm multiplied by 2.0 mm), insulating shell, sensitive action, long service life and the like, is widely suitable for thermal overload protection caused by abnormal working states such as overload and locked rotor of a single-phase motor, and can also be used for overheat and overcurrent double protection of general electric equipment such as an electric heating appliance, a fluorescent lamp rectifier, a transformer, an automobile motor, an integrated circuit and the like.

The temperature switch 4 comprises a shell 401, wherein a static contact piece 404 is arranged on the inner wall of the bottom of the shell 401, a movable contact piece 407 is arranged on the inner wall of the top of the shell, a bimetallic strip 403 is arranged at the bottom of the movable contact piece 407, a movable contact 402 is arranged on one side of the bottom of the bimetallic strip 403, a fixed seat 405 is arranged on one side between the bimetallic strip 403 and the static contact piece 404, and a wire 408 is arranged at one end of the fixed seat 405. Normally, the bimetal 403 is in a free state, the movable contact 402 and the stationary contact 404 are in a closed/open state, and when the temperature rises to an operation temperature value, the bimetal element is heated to generate internal stress to rapidly act, so that the contact is opened/closed, and a circuit is cut off/closed.

The product has the advantages of high temperature response speed and timely turn-off of the circuit. The safety performance of the lithium ion battery is improved. In a certain space, the electronic product has the characteristics of higher capacity, the cruising ability of the electronic product is improved, and the user experience is improved. The method can be widely applied to portable electronic products with limited space.

The bimetal 403 is arc-shaped, a gap is reserved between one end of the bimetal 403, where the movable contact 402 is installed, and the static contact 404, the bimetal 403 is in a free state, the movable contact 402 and the static contact 404 are in a closed/open state, when the temperature rises to an action temperature value, the bimetal element is heated to generate internal stress to act rapidly, and the contact is opened/closed to cut off/switch on a circuit. The product has the advantages of high temperature response speed and timely turn-off of the circuit. The safety performance of the lithium ion battery is improved. In a certain space, the electronic product has the characteristics of higher capacity, the cruising ability of the electronic product is improved, and the user experience is improved. The method can be widely applied to portable electronic products with limited space.

An epoxy resin 406 is arranged between the fixing seat 405 and the lead 408, and one end of the temperature switch 4, which is positioned on the lead 408, is sealed by the epoxy resin 406. The battery cell 1 and the PCB 3 are welded and fixed through nickel plates, and the connecting wire 5 and the PCB 3 are welded and fixed through tin. The temperature switch 4 is fixed on the PCB 3 by soldering and forms a series circuit with the battery cell 1. When the lithium ion battery with temperature protection is used, the temperature switch 4 is connected in series to the current, and the temperature and the current are actively controlled, so that the risk of combustion and explosion of the lithium ion battery is reduced, and the safety of the lithium ion battery is improved. Meanwhile, the temperature switch 4 is small in size, more structural space can be provided for increasing and decreasing the capacity of the lithium ion battery, the cruising ability of the electronic product is improved, and the use experience of a user is improved.

Working principle: the temperature switch 4 adopts a bimetallic strip 403 with a certain geometric shape, does not need an auxiliary mechanism or a thermosensitive polymer resistor structure, and only depends on self temperature sensing and current heating effect of the bimetallic strip 403, so that the state of the bimetallic element is quickly changed, and the contact 402 is directly driven to realize automatic circuit switching-off and switching-on, thereby playing roles of overheat and overload protection. Has the advantages of small volume, high sensitivity and the like.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Claims

1. The utility model provides a lithium ion battery with temperature protection, includes electric core (1) and protective housing (2), its characterized in that: the battery cell is characterized in that a PCB (3) is arranged at one end of the top of the battery cell (1), a temperature switch (4) is welded on one side of the PCB (3), a connecting wire (5) is welded on one side of the PCB (3), a connecting terminal (6) is arranged at one end of the connecting wire (5), and a protective shell (2) is arranged outside the PCB (3) and the temperature switch (4).

2. A lithium ion battery with temperature protection according to claim 1, wherein: the temperature switch (4) comprises a shell (401), a static contact (404) is arranged on the inner wall of the bottom of the shell (401), a movable contact (407) is arranged on the inner wall of the top of the shell, a bimetallic strip (403) is arranged at the bottom of the movable contact (407), a movable contact (402) is arranged on one side of the bottom of the bimetallic strip (403), a fixed seat (405) is arranged on one side between the bimetallic strip (403) and the static contact (404), and a wire (408) is arranged at one end of the fixed seat (405).

3. A lithium ion battery with temperature protection according to claim 2, characterized in that: an epoxy resin (406) is arranged between the fixing seat (405) and the lead (408), and one end of the temperature switch (4) positioned on the lead (408) is sealed by the epoxy resin (406).

4. A lithium ion battery with temperature protection according to claim 1, wherein: the battery cell (1) is welded and fixed with the PCB (3) through a nickel plate, and the connecting wire (5) is welded and fixed with the PCB (3) through tin.

5. A lithium ion battery with temperature protection according to claim 2, characterized in that: the bimetal (403) is arc-shaped, a gap is reserved between one end of the bimetal (403) where the movable contact (402) is installed and the static contact (404), the bimetal (403) is in a free state, the movable contact (402) and the static contact (404) are in a closed/open state, when the temperature rises to an action temperature value, the bimetal element is heated to generate internal stress to act rapidly, and the contact is opened/closed to cut off/switch on a circuit.

6. A lithium ion battery with temperature protection according to claim 1, wherein: the temperature switch (4) is fixed on the PCB (3) through soldering and forms a series circuit with the battery core (1).